Variometer



Jan. 6, 1942. G. S'CHNEIDER 2,268,850

VARIOMETER Filed June 19, 1940 MAG/vine Marie/0L MAG/V6 776 M0 nae/04 INVENTOR GUN TER 612/5/05 BY 7 ATTORNEY Patented Jan. 6, 1942 VARIOMETER Giinter Schneider,

Berlin, Germany, assignor to Telefunken Gesellschaft fiir Drahtlose Telegraphic in. tion of Germany Application June 19, 194-0,

Germany March 31, 1939 4 Claims.

The present invention is concerned with a variometer construction which is based upon a variation of the inductance value of a coil of flat form by causing a hood of high-frequency iron material or highly-conducting material more or less to cover the coil by means of a rotary motion about an axis at right angles to the coil surface. If the said hood is made of high fre quency iron, as will be seen, an increase of the inductance is brought about in proportion as the covering of the coil is increased by the hood as a result of the growing influence of the relatively high permeability of the high frequency iron. However, in the same or in a similar embodiment and form of construction, the hood could also be made of non-ferromagnetic material, say, a high-conductivity material such as copper. In this case, as the covering of the coil proceeds and grows, there occurs a reduction of the inductance as a result of the short-circuit currents set up in the hood.

In carrying the idea into practice either the coil may be stationary and the hood rotatable or else the hood may be stationary and the coil rotating. The coil which is used is of a semicircular, flat type so that as rotation proceeds, a more or less large surface and area is turned into the hood, or vice versa, may be turned about the hood.

A preferable application and embodiment of the idea underlying this invention is to combine the variometer constructionally with a condenser, for instance, by mounting in the coil support the stator coat or plate of the condenser, while the rotor plate is secured upon the axis of rotation (shaft) which serves for turning the coil or the hood, as the case may be.

An exemplified embodiment of the invention is illustrated in the appended drawing wherein Figure 1 illustrates a preferred embodiment of the invention using a magnetic hood; Figure 2 illustrates another embodiment of the invention wherein acondenser plate is mounted on a face of a magnetic hood; and, Figure 3 illustrates a modification of the invention wherein the hood is composed of non-magnetic conducting material and one face is used as a condenser plate.

Referring to the drawing, L denotes the semicircular, preferably multi-layer, coil. H is the hood, W the shaft by means of which the hood is turned over the coil. T is the support upon which the coil is seated, K the condenser coat secured on the coil support and R the rotor plates which are seated upon the shaft W. As can be readily seen there is brought about a b. H., Berlin,

Germany, a corpora- Serial No. 341,284

change in inductance value of the coil upon rotation, while at the same time there occurs also a change in the capacity of the condenser.

The invention is capable of several modifications, for instance, as shown in Figures 2 and 3 by using the hood as the support for a condenser coat or plate. If high frequency iron is used for the hood, then, as shown in Figure 2, the coat may consist of a highly conducting metallic layer R, while the cooperating condenser plate K is disposed upon the inside, that is, the face of the support T opposite and turned towards the coil L. But if the hood consists of highly conducting material, such as copper (see Figure 3), then the same that is, face R could be used directly to act as a condenser coat.

It will be understood that the invention is not restricted to the exemplified embodiment here shown. For the sake of completeness of disclosure it may finally be said that the coil need not be perfectly semi-circular, but that its contour could also be uniform, for instance, as is customary with condenser plates. What is usually insured by the section or contour form of condenser plates may here be obtained by the shaping of the coil.

I claim:

1. In a variable tuning instrumentality, a coil formed of a plurality of stacked substantially semi-circular fiat coil sections, a substantially semi-circular metallic hood for said coil, mounted in co-axial relationship with said stacked sections, said hood and coil being relatively rotatable and positioned so as to provide for inserting different amounts of the coil within the hood.

2. In a variable tuning instrumentality, a variometer comprising a coil formed of a plurality of stacked substantially semi-circular flat coil sections, a substantially semi-circular hood of ferro-magnetic material for said coil, said hood and coil being mounted for relative rotation about an axis which is at right angles to the surfaces of said coil sections to thereby provide for covering any desired amount of said coil by said hood.

3. In a variable tuning instrumentality, a variometer comprising a coil formed of a plurality of stacked substantially semi-circular fiat coil sections, a substantially semi-circular hood of conducting material for said coil, said hood and coil being mounted for relative rotation about an axis which is at right angles to the surfaces of said coil sections, a condenser including a stator section and a rotor section, one of said condenser sections being" formed at least in part by said hook, the other condenser section being mounted for relative rotation with respect to the said hood.

4. In a, variable tuning instrumentality, a variometer comprising a coil formed of a plurality of stacked substantially semi-circular fiat coil sections, a substantially semi-circular hood of ferro-magnetic material for said coil, said hood and, coil being mounted for relative rotation about an axis which is at right angles to the surfaces of said coil sections, a condenser having a rotor section and a stator section, said two condenser sections being mounted for relative rotation about said same axis and common means acting upon operation to cause simultaneously relative rotation between said coil and hood and between said stator section and rotor section.

GUNTER SCHNEIDER. 

